Replacing your HVAC system is one of the largest home investments you'll make — but with the 2025 federal tax credits, the net cost is lower than it's been in decades. Here's what to expect.
Average HVAC Replacement Costs
- Central air conditioner (AC only): $3,500–$7,500 installed
- Gas furnace: $2,500–$7,500 installed
- Air source heat pump (replaces AC + furnace): $5,000–$14,000 installed
- Ductless mini-split heat pump: $3,000–$8,000 per zone installed
- Geothermal heat pump: $15,000–$30,000 installed (qualifies for 30% 25D credit)
Federal Tax Credits Available in 2025
Heat pumps (air source): up to $2,000 federal credit under IRC 25C. Geothermal heat pumps: 30% of installation cost under IRC 25D (no cap). Central AC and gas furnaces: no federal credit. This credit structure strongly favors heat pump replacement over gas furnace or AC-only replacement.
What Drives HVAC Cost Variation
System size (tonnage): A 2-ton unit for a 1,000 sqft home vs. a 5-ton unit for 2,500 sqft. Oversizing is common and costly — always insist on a Manual J load calculation.
Efficiency rating: Higher SEER2/HSPF2 ratings cost more upfront but operate cheaper. At current electricity rates, a 20 SEER2 system vs. a 14 SEER2 saves $150–$300/year — often worth the premium.
Ductwork: Existing duct condition significantly affects cost. Sealing or replacing deteriorated ducts adds $500–$3,000 but dramatically improves efficiency.
Labor market: HVAC contractor availability and local wages vary significantly by region.
How to Avoid Overpaying
Get at least 3 written quotes with itemized breakdowns (equipment vs. labor vs. materials). Verify all contractors are NATE-certified and licensed. Ask each contractor to show you a Manual J calculation justifying the system size — any contractor who doesn't do one is guessing. HomeShark connects you with 3 vetted local HVAC contractors who provide competitive quotes at no cost to you.